Note

MU Extension does not endorse commercial products.

Follow the label on all pesticides.

Disease resistant and tolerant plant varieties

Disease resistance or tolerance does not mean the plant is immune to a disease and will show no symptoms. Many varieties listed as disease resistant will show reduced symptom development of a specific disease when compared to a susceptible variety. Also, some types of disease resistance are only effective against certain strains or races of the disease causing pathogen. Consequently, a variety listed here as resistant may still acquire the disease under certain circumstances.

Ash

Relatively resistant to anthracnose

Green ash

Tolerant of ash yellows

Green ash often tolerates infection without progressive decline

Azalea

Most resistant to phytophthora root rot

Formosa

Fakir

Corrine Murrah

Indica hybrids as a group

Note Extremes in soil moisture often affect susceptibility.

Callery pear (flowering ornamental
pear)

Highly susceptible to fire blight

'Aristocrat'

'Autumn Blaze'

'Capital'

'Fauriei'

'Redspire'

Moderately susceptible to fire blight

'Cleveland Select'

'Earlyred'

'Whitehouse'

Moderately resistant to fire blight

'Bradford'

Cotoneaster

Resistant to fire blight

Cotoneaster adpressus

Cotoneaster apiculatua

Cotoneaster dielsiana

Cotoneaster foveolatus

Cotoneaster franchetii

Cotoneaster integerrimus

Cotoneaster nitens

Cotoneaster zabelii

Cottonwood

Susceptible to Mycosphaerella (Septoria) leaf spot and stem canker

All native North American species of poplar and aspen

Note Check with local nurseryman or catalogs for information about resistant
clones.

Crabapple

Resistant to cedar-apple rust, fire blight and scab

Adams

Adirondack

Autumn Glory

Beauty

Centurion

Color Parade

David

Dolgo

Donald Wyman

Doubloons

Gibbs Golden Gage

Golden Raindrops

Indian Summer

Jewelberry

Molten Lava

Narragansett

Pink Princess

Prairiefire

Prof. Sprenger

Robinson

Sargentii

Strawberry Parfait

Sugar Tyme

White Angel

White Cascade

Note Check with nurserymen or catalogs for other varieties. Resistance may
vary under different growing conditions.

Elm

Somewhat resistant to black leaf spot

Chinese

Japanese

Siberian elms

Resistant to black leaf spot

Dynasty

Groeneveld

Homestead

Jacan

Pioneer

Regal

Sapporo Autumn Gold

Thompson

Urban

Juniper

Resistant to phomopsis tip blight and rusts

Juniperus chinensis cv. Foemina and var. sargentii

Juniperus communis cv. Aureospica cv. Suecica and var. saxatilis

Juniperus sabina

Juniperus squamata var. fargesii

Juniperus virginiana cv. Tripartita

Lilac

Severely affected by powdery mildew

Syringa vulgaris, common lilac

Pine

Very susceptible to brown spot

Short needle Scots pine varieties from France and Spain

Resistant to brown spot

Long needle Scots pine varieties from Germany and Austria

Resistant to dothistroma needle blight

Scots pine

Resistant to pine wilt

Shortleaf

Jack

Eastern white pines

Plum

Resistant to black knot

President

Slightly susceptible to black knot

Formosa

Shiro

Santa Rosa

Moderately susceptible to black knot

Fellenburg

Methley

Milton

Bradshaw

Early Italian

Highly susceptible to black knot

Stanley

Damson

Bluefree

Shropshire

Not susceptible to plum pockets

Commercial varieties from European and Asian sources

Pyracantha (firethorn)

Resistant to fire blight

Pyracantha coccinea cv. 'Sensation'

Pyracantha koidzumii and cv. 'Santa Cruz Prostrata'

'San Jose' hybrid

'Shawnee' hybrid

Somewhat resistant to scab

Pyracantha coccinea 'Government Red'

'Prostrata'

'Rutgers'

P. koidzumii 'Bella'

'Duval'

'Santa Cruz Prostrata'

'Flava'

'Shawnee' hybrid

'Firey Cascade' hybrid

Rhododendron

Resistant cultivars to phytophthora root rot

Caroline

Professor Hugo deVries

Red Head

Note Extremes in soil moisture often affect susceptibility.

Rose

Susceptible to black spot

Yellow or gold flowering types generally are more susceptible than red or
pink ones

Resistant to black spot

Rosa rugosa cultivars and hybrids

Rosa wichuriana cultivars

Note Because of the wide variety of cultivars and hybrids available, consult
catalogs or your local nurseryman for more information.

Susceptible to powdery mildew

Species and cultivars differ widely

Spruce

Relatively resistant to rhizosphaera needlecast

Norway spruce

Sycamore

Highly susceptible to anthracnose

Native sycamores

Resistant to anthracnose

London plane trees, but hybridization with susceptible sycamores can produce
susceptible seedlings